Crydom spf series 25a solid state relay sip panel mount crydom spf480d25 this 25a solid state relay has an operating voltage of 48 to 660v ac and a control voltage of 4 to 15v dc the ssr features an integrated heatsink design that provides excellent thermal management the relay has an optically separated scr output and also features low leakage current in off state mode and high peak current making it suitable for a wide range of heavy industrial applications crydom spf480d25 solid state